nixos/tests: add matrix-synapse test

nixos/release.nix

···
   tests.login = callTest tests/login.nix {};
   #tests.logstash = callTest tests/logstash.nix {};
   tests.mathics = callTest tests/mathics.nix {};
+  tests.matrix-synapse = callTest tests/matrix-synapse.nix {};
   tests.mesos = callTest tests/mesos.nix {};
   tests.misc = callTest tests/misc.nix {};
   tests.mongodb = callTest tests/mongodb.nix {};

nixos/tests/matrix-synapse.nix

···
+import ./make-test.nix ({ pkgs, ... } : {
+
+  name = "matrix-synapse";
+  meta = with pkgs.stdenv.lib.maintainers; {
+    maintainers = [ corngood ];
+  };
+
+  nodes = {
+    server_postgres = args: {
+      services.matrix-synapse.enable = true;
+      services.matrix-synapse.database_type = "psycopg2";
+    };
+
+    server_sqlite = args: {
+      services.matrix-synapse.enable = true;
+      services.matrix-synapse.database_type = "sqlite3";
+    };
+  };
+
+  testScript = ''
+    startAll;
+    $server_postgres->waitForUnit("matrix-synapse.service");
+    $server_postgres->waitUntilSucceeds("curl -Lk https://localhost:8448/");
+    $server_postgres->requireActiveUnit("postgresql.service");
+    $server_sqlite->waitForUnit("matrix-synapse.service");
+    $server_sqlite->waitUntilSucceeds("curl -Lk https://localhost:8448/");
+    $server_sqlite->mustSucceed("[ -e /var/lib/matrix-synapse/homeserver.db ]");
+  '';
+
+})